Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1991-11-29
1992-11-10
Hoff, Marc
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341163, H03M 302
Patent
active
051627990
ABSTRACT:
An A/D converter comprises a first stage integrator for receiving an input signal, a last stage integrator, a multibit A/D converter connected to the output terminal of the last stage integrator, an outer feedback loop connected between the output terminal of the multi-bit A/D converter and the input terminal of said first stage integrator and having a 1-bit D/A converter, an inner feedback loop connected between the output terminal of the multibit A/D converter and the input terminal of the last stage integrator and having a multibit D/A converter, and a digital signal processing circuit, connected to the output terminal of the A/D converter, for performing digital signal processing of an output from the A/D converter to eliminate quantization noise caused by the outer feedback loop.
REFERENCES:
patent: 5027120 (1991-06-01), Thurston
A. Hairapetian et al., Multibit Sigma-Delta Modulator with Reduced Sensitivity to Dac Nonlinearity, Electronics Letters May 23, 1991, vol. 27, No. 11, pp. 990-991.
Hoff Marc
Kabushiki Kaisha Toshiba
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